43
48-640 E3 Modulevel
®
Displacer Level Transmitter - FOUNDATION fieldbus
™
There can be several reasons for a FO
UNDATION
fieldbus
™
installation to be in a faulty condition. In order to assure
that communication can be established, the following
requirements must be met.
• Device supply voltage must be higher than 9 VDC with a
maximum of 32 VDC.
• Total current draw of a given segment cannot exceed the
rating shown on the power conditioner and/or barrier.
• Device polarity must be correct.
• Two 100 Ω, 1 µF terminators must be connected to the
network—one at each end of the segment.
• Cable length plus spur length must not exceed the following
values:
• The cable shield is to be hard grounded only at one point
close to the DCS. In addition, the cable shield can be
capacitively grounded in multiple places to improve EMC
protection.
• Ensure all devices are on the “live list,” and the schedule has
been downloaded.
• Ensure the device identity is in the Resource Block.
• Ensure that the Resource Block, then the Transducer Block,
and lastly the Function Block(s) are in“Auto” mode rather
than Out of Service (OOS).
If all of these requirements are met, a stable communication
should be established.
25–32 — — — —
19–24 100 ft. (30 m) — — —
15–18 200 ft. (60 m) 100 ft. (30 m) — —
13–14 300 ft. (90 m) 200 ft. (60 m) 100 ft. (30 m) —
1–12 400 ft. (120 m) 300 ft. (90 m) 200 ft. (60 m) 100 ft. (30 m)
Single Yes Yes AWG 18 (0.8 mm2) 6,200 ft. (1,900 m) A
Multi Yes Yes AWG 22 (0.32 mm2) 3,900 ft. (1,200 m) B
Multi No Yes AWG 26 (0.13 mm2) 1,300 ft. (400 m) C
Multi Yes No AWG 16 (1.25 mm2) 650 ft. (200 m) D
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